package com.yupi.yupicturebackend.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.yupi.yupicturebackend.constant.UserConstant;
import com.yupi.yupicturebackend.exception.BusinessException;
import com.yupi.yupicturebackend.exception.ErrorCode;
import com.yupi.yupicturebackend.mapper.UserMapper;
import com.yupi.yupicturebackend.model.dto.user.UserQueryRequest;
import com.yupi.yupicturebackend.model.entity.User;
import com.yupi.yupicturebackend.model.enums.UserRoleEnum;
import com.yupi.yupicturebackend.model.vo.LoginUserVO;
import com.yupi.yupicturebackend.model.vo.UserVO;
import com.yupi.yupicturebackend.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author 25472
 * @description 针对表【user(用户)】的数据库操作Service实现
 * @createDate 2025-08-22 19:35:16
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {

    /**
     * 用户注册
     *
     * @param userAccount   用户账户
     * @param userPassword  用户密码
     * @param checkPassword 校验密码
     * @return 新用户 id
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 1.校验参数
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码过短");
        }
        if (!userPassword.equals(checkPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "两次输入密码不一致");
        }
        // 2.校验账户是否存在
        long count = this.baseMapper.selectCount(new QueryWrapper<User>().eq("userAccount", userAccount));
        if (count > 0) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "账号重复，用户已存在");
        }
        // 3.密码加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 4.插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("默认姓名");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean saveRest = this.save(user);
        if (!saveRest) {
            throw new BusinessException(ErrorCode.SYSTEM_ERROR, "注册失败,数据库错误");
        }
        return user.getId();
    }

    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request) {
        // 1.校验参数
        if (StrUtil.hasBlank(userAccount, userPassword)) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "参数为空");
        }
        if (userAccount.length() < 4) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户账号错误");
        }
        if (userPassword.length() < 8) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户密码错误");
        }
        // 2.对用户的密码进行加密
        String encryptPassword = getEncryptPassword(userPassword);
        // 3.查询数据库中用户是否存在
        LambdaQueryWrapper<User> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(User::getUserAccount, userAccount);
        lambdaQueryWrapper.eq(User::getUserPassword, encryptPassword);
        User user = this.baseMapper.selectOne(lambdaQueryWrapper);
        // 不存在抛异常
        if (null == user) {
            log.info("user login failed,userAccount cannot match userPassword");
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "用户不存在或者密码错误");
        }
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE, user);
        // 4.记录用户的登录态
        return getLoginUserVO(user);
    }

    @Override
    public String getEncryptPassword(String userPassword) {
        // 加盐，混淆密码
        final String salt = "yupi";
        return DigestUtils.md5DigestAsHex((salt + userPassword).getBytes());
    }

    @Override
    public User getLoginUser(HttpServletRequest request) {
        // 从session中获取当前登录用户,判断当前是否登录
        Object user = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) user;
        if (null == currentUser) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        long userId = currentUser.getId();
        currentUser = this.getById(userId);
        if (null == currentUser) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }

        return currentUser;
    }

    /**
     * 获取脱敏后登录用户
     *
     * @param user 用户
     * @return 脱敏用户
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null) {
            return null;
        }
        LoginUserVO loginUserVo = new LoginUserVO();
        BeanUtil.copyProperties(user, loginUserVo);
        return loginUserVo;
    }

    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtil.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVoList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream()
                .map(this::getUserVO)
                .collect(Collectors.toList());
    }

    @Override
    public boolean userLogout(HttpServletRequest request) {
        // 从session中获取当前登录用户,判断当前是否登录
        Object user = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        if (null == user) {
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }
        // 移除登录状态
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);
        return true;
    }

    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), sortOrder.equals("ascend"), sortField);
        return queryWrapper;
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }


}




